12987523 has 2 divisors, whose sum is σ = 12987524. Its totient is φ = 12987522.

The previous prime is 12987509. The next prime is 12987547. The reversal of 12987523 is 32578921.

It is a weak prime.

It is an emirp because it is prime and its reverse (32578921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12987523 - 2²¹ = 10890371 is a prime.

It is equal to p₈₄₈₄₆₇ and since 12987523 and 848467 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (12987593) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6493761 + 6493762.

It is an arithmetic number, because the mean of its divisors is an integer number (6493762).

Almost surely, 2^12987523 is an apocalyptic number.

12987523 is a deficient number, since it is larger than the sum of its proper divisors (1).

12987523 is an equidigital number, since it uses as much as digits as its factorization.

12987523 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30240, while the sum is 37.

The square root of 12987523 is about 3603.8206115177. The cubic root of 12987523 is about 235.0582200703.

The spelling of 12987523 in words is "twelve million, nine hundred eighty-seven thousand, five hundred twenty-three".